Rotary pump.



D. S. BOND.

ROTARY PUMP. APPLIUATIQN FILED JUNE 2, 1911. 1,012,237, Patented Dec.19,1911.

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Dwz'yfii 15130724 WRKW BY D.S.BONDQ ROTARY PUMP.

APPLICATION FILED JUNE 2, 1911.

Patented Dec. 19, 1911.

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UNITED STATES PATENT OFFICE- DWIGHT S. BOND, OF CONWAY, MASSACHUSETTS,ASSIGNOR 0F ONE-HALF TO' WILLIAM M. FLAGG, OF CONWAY, MASSACHUSETTS.

ROTARY PUMP.

To all whom it may concern:

Be it known that I, DWIGHT S. BOND, a

citizen of the United States of America, re-

siding at Conway, in the county of Franklin and State of Massachusetts,have invented new and useful Improvements in Rotary Pumps, of which thefollowing is a specification.

This invention relates to the class of rotary pumps of the rotary wingpiston type, the object of the invention being to provide an improvedconstruction of this type of pumps, all as fully set forth in thefollowing specification and pointed out in the claims.

The invention is clearly illustrated in the accompanying drawings inwhich,-

Figure 1 is an end elevation of a pump embodying the improvement,one ofthe side plates having been removed,the shaft and a part of the in-takeportion of the easing being shown in section substantially on line 1--1,Fig. 3. This shows the position of the parts at the end of the dischargestroke. Fig. 2 is a perspective view of one of the side plates of thepump casing, together with the wing piston and the movable partitlonlocated between the inlet and the outlet ports of the casing. Fig. 3 isa sectional, plan view, substantially on the line 33, Fig, 4:. Fig. 4 isa view similar to Fig. 1 showing the position of the parts on theln-take stroke.

Referring to the drawings, the pump casing a is in the form of acylindrical casting having a box-like extension 6 on one side thereof,in the upper end of which is the outlet 0 and in the lower end the inletcl,these two ports being separated by a partition 6, the box-likeextension 5 communicating on both sides of the said partition with theinterior of the casing a, as clearly shown in Figs. 1 and 4. The casingproper is provided with the annular flanges f to which are bolted theflanged rings 9 and h which extend inward beyond the wall of the casinga, as at 70, to constitute an annular support for the border of the endplates m which hermetically seal the opposite sides of the cylindricalcasing. Extending centrally. through the end plates m is a driving-shaft0 supported in bearings 22 cast integral with the rings 9 and .h. Thewing piston q is cylindrical in form and is fixed on the driving-shaft 0and has the end plates m rigidly secured thereto, as by theSpecification of Letters Patent.

Application filed June 2, '1911.

Patented Dec. 19, 1911. Serial No. 630,881.

screws 7". The shaft 0 extends through the piston g eccentric thereto,the degree of eccentricity of the piston within the casing being such asto bring the periphery of the piston tangent to the cylindrical interiorwall thereof. At the point of contact of the piston with the interiorwall of the casing a bearing plate 8 of suitable metal is let into atransverse groove in the piston, this plate resting upon a resilientcushion t of rubber, preferably, whereby it may always have a yieldingbearing against the inner wall of the casing. Located in the partitionwall 6 between the outlet port 0 and the inlet port d is a swingingpartition to having a hingesupport at w in said partition wall 6 andextending from one of the plates m to the other and fitting closelybetween said plates. Fitted in the periphery of the piston Q is a shoe ywith which the inner edge of the movable partition w is hinge-connected,as at 3. Between the back side of the partition w and the casing is aspring 4 whose function is to press said swinging partition toward thepiston. Between said partition and the shoe g bearing on the piston isanother spring 5 whose function is to hold the shoe y to a bearing onthe piston, it being of course understood that the shoe 1 is of the samewidth as the partition u; with its ends fitting closely against theplates m. It will be seen that by this construction, when the 1 partsare in the position shown in Fig. 4 for example, the interior of thepump casing is divided into two parts by the partition to, the shoe yand the piston, and that the inlet port (Z is on one side of thispartition and the outlet 0 on the other. 7

Located over the in-take port 61 and within the lower portion of thebox-like extension Z) of the casing is a clapper-valve 6 hinged to thecasing, preferably, and operating like a check-valve to prevent anywater from being forced back through the inlet pipe while the piston ismoving from the position shown in Fig. 1 to a point just past theopening 7 leading from the lower half of the extension chamber 6 intothe casing. For while the piston is passing through this portion of itscircular path it would, were it not for the valve 6, tend to force moreor less water back through the inlet port.

Any movement of the water, however, in

this direction tends to close that port.

It will readily be seen from the above description that as soon as thecontact point of the piston g has passed the openings 7 leading to theinlet port, the continued movement of the piston in the direction of thearrow will tend to create suction through the inlet port, this samemovement of the piston pushing before it water that has been drawn intothe casing on the preceding stroke, the casing being filled at eachrevolution of the piston.

By making the end plates at rotatable with the piston the packing of theedges of these plates is rendered necessary in order to provide a tightpump-casing, and this packing is readily effected by beveling the edgesof the end plates, as at 8, and inserting in an annular groove turned inthe flanged rings 9 and h a packing ring 9 of suitable material, thisring being backed up by a metal ring 10 against which bear the ends ofbolts 12 whereby the packing ring 9 may be forced against the bevelededge of the plates m to provide a water-tight joint at that point.

The packing plate 8 is made of sufficient width to permit it to passfrom the interior wall of the casing, as shown in Fig. 1, over onto theshoe 3 to the end that it may engage one side of the shoe before leavingthe casing, and at the other side of the shoe that it may engage thecasing before leaving the shoe, thereby insuring its smooth rotation;the shoe 3 serving not only as a part of the movable partition extendingtransversely of the casing but serving also to carry the bearing plate 8across the break in the cylindrical wall of the casing at the pointwhere the extension chamber Z) opens into the latter. The small openings7 in the wall of the casing near the inlet port are solely for thepurpose of affording a proper bearing for the plate 8 after it has movedpast the lower end of the shoe 3 Otherwise, these small open ings haveno function.

What I claim, is

1. A rotary pump of the class described comprising a cylindrical casinghaving a two-part offset chamber on one side thereof, each part of said.chamber communicating with the interior of the casing, inlet and outletports being located respectively in said two parts of the chamber; ashaft extending axially through the casing, a cylindrical wing pistoneccentrically secured on the shaft, the periphery of the piston beingtangent to the inner wall of the casing; a swinging partition supportedby one end in the casing, a shoe having a bearing on the piston andconstituting a support for the other end of said partition, and twocircular side plates constituting a closure for the ends of the casing,said plates being fixed to the piston and rotating therewith; acheckvalve in the inlet port, and means to press the swinging partitionyieldingly toward the piston.

2. A rotary pump of the class described comprising a cylindrical casinghaving a two-part offset chamber on one side thereof, each part of saidchamber communicating with the interior of the casing, inlet and outletports being located respectively in said two parts of said chamber;rotatable plates constituting closures for the ends of the casing, andwings secured to the casing to retain the plates, a packing beingprovided between the rings and said plates; a shaft extending axiallythrough the plates and casing, and a cylindrical wing pistoneccentrically secured on said shaft and to said plates, said pistonbeing tangent to the inner wall of the casing; a shoe having a bearingon the piston, and a swinging par tition hinge-support on the shoe andon the casing, and means to press the shoe and partition yieldinglytoward the piston, and a check-valve located in the inlet port.

3. A rotary pump comprising a pump chamber, inlet and outlet portsthereto, rotary pumping means in the chamber, a central shaft to rotatesaid pumping means, end closing walls for said chamber fixed to saidshaft and rotatable therewith, an annular retaining ring fastened to theside walls of said chamber for each endclosing wall, anda packingbetween said retaining rings and said end-closing walls.

I DWIGHT s. BOND.

Vitnesses 711. H. CHAPIN, HARRY WV. BOWEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

